表面涂层导线正极性电晕起始电压的计算与实验研究  

Numerical Calculation and Experimental Study of Positive Onset Voltage of Coated Conductors

作　　者：怡勇[1] 张楚岩[1] 陈正颖 王黎明[1] 

机构地区：[1]清华大学深圳研究生院,广东省深圳市518055

出　　处：《中国电机工程学报》2016年第3期853-860,共8页Proceedings of the CSEE

基　　金：国家重点基础研究发展计划项目(973项目)(2011CB 209406);国家自然科学基金项目(51377096)~~

摘　　要：针对超/特高压直流输电线路导线人工划痕磨损及防覆冰需要,会在导线表面喷涂RTV涂料或防冰涂层等憎水性涂料,同时涂层导线的起晕电压会有较大的提高,涂层对降低导线电晕强度有明显的效果。为了分析电晕笼中导线表面涂层对正极性起晕电压的影响,首先采用模拟电荷法,建立了多层模拟电荷电晕笼涂层导线电场的计算模型,分析了电晕笼涂层导线的电场分布。然后,在经典正极性起晕电压判据的基础上,提出了基于光电离模型且考虑光子辐射波长的涂层导线正极性起晕电压起始判据。同时,在实验室搭建了电晕笼涂层导线起晕电压测量平台,对不同直径的干净导线及涂层导线正极性起晕电压进行测量,并将测量结果与计算值相比较,二者基本吻合。在此基础上进一步分析表明,涂层导线随着涂层厚度的增加,起晕电压显著提高;随着涂层介电常数的增加,起晕电压略微下降。Conductors are coated by room temperature vulcanized silicone rubber（RTV） or ice-phobic coating in EHVDC/UHVDC power transmission lines. RTV coating is used to repair the impact induced stretches of the conductor surface and the ice-phobic coated conductors are employed on the anti-icing of transmission lines. The onset voltage of the coated conductors is higher than that of the clean conductors and the corona discharge intensity of the coated conductor is weakened. In order to analyze the positive onset voltage（POV） of the coated conductor in the corona cage, firstly, the potential gradient distribution of coated conductor was calculated in the corona cage by charge simulation method. Then, based on the classic positive onset criterion, the photoionization model considering the effective radiation wavelength of POV was presented to calculate the POV of the coated conductor. The POV measurement platform was constructed to measure the POV of the clean and coated conductors. The measurement values were agreed satisfactorily with the calculation values. A further analysis shows that the POV increases as the coating layer thickness increases and slightly decreases with the coating layer relative permittivity increases.

关 键 词：高压直流 涂层导线 正极性起晕电压 电晕笼 光电离 波长 

分 类 号：TM85[电气工程—高电压与绝缘技术]